https://nostr.directory was a good way a while back.  Not sure if it still is- it's been a while since I used it.

At the bare minimum, put your npub somewhere easily verifiable on your website.  If you want to use a nostr icon you can find some at https://github.com/satscoffee/nostr_icons from npub1a6zkqnuwcmjwynuw4u4xyngy9675x8dwgj87z9me4h8mdwmc2a0q8mvhjk
p, li { white-space: pre-wrap; }p, li { white-space: pre-wrap; }